Product Specification SG6105 Power Supply Supervisor + Regulator + PWM FEATURES DESCRIPTION PC half-bridge (or 494) power supply supervisor + two 431 + PWM High integration & few external components Over-voltage protection for 3.3V, 5V and 12V Under-voltage protection for 3.3V, 5V and 12V Under-voltage protection for –12V and/or –5V Over-power and short-circuit protection Power-down warning circuitry Power good circuitry Delay time for PSON and PG signal Remote ON/OFF function On-chip oscillator and error amplifier Two shunt regulator for 3.3V and 5V-Standby Latching PWM for cycle-by-cycle switching Push-pull PWM operation and totem pole outputs Soft-start and maximum 93% duty cycle APPLICATIONS Switching mode power supply for Computers, such as: ATX NLX SG6105 controller is designed for switching mode power supply for desktop PCs. It provides all the functions necessary to monitor and control the output of the power supply. Remote ON/OFF control, power good circuitry, some protection features against over-voltage and over-power are implemented. It directly senses all the output rails for OVP without the need of external dividers. An innovated AC-signal sampling circuitry provides a sufficient power-down warning signal for PG. A built-in timer generates accuracy timing for control circuit including the PS-off delay. The cycle-by-cycle PWM switching prevents the power transformer from the saturation and ensures the fastest response for the short-circuit protection which greatly reduce the stress for power transistors. Two internal precision TL431 shunt regulators provide stable reference voltage and driver for 3.3V and 5V-standby regulation. Utilizing minimum number of external components, the SG6105 includes all of the functions for push-pull and/or half-bridge topology, decreasing the production cost and PCB space, and increasing the MTBF for power supply. SFX (micro-ATX) MARKING DIAGRAMS PIN CONFIGURATION 20 PSON 1 20 VCC SG6105T V33 2 19 RI XXXXXXXYYWWV V5 3 18 SS OPP 4 17 IN UVAC 5 16 COMP NVP 6 15 GND V12 7 14 FB1 OP2 8 13 VREF1 OP1 9 12 VREF2 PG 10 11 FB2 1 T: D = DIP XXXXXXX: Wafer Lot YY: Year; WW: Week V: Assembly Location ©System General Corp. Version 2.3(IRO33.0011.B0) -1- www.sg.com.tw June 19, 2003 Product Specification SG6105 Power Supply Supervisor + Regulator + PWM ORDERING INFORMATION Part Number Package SG6105D 20-Pin DIP PIN DESCRIPTIONS Name Pin Type Function VCC 20 Supply Supply voltage. 4.5V ~ 5.5V. It is connected to 5V-standby. PG 10 Logic output Power Good logic output, 0 or 1 (open-collector). PG = 1 means that the power is good for operation. The PG delay is 300 msec. V33 2 Analog input 3.3V over-voltage/under-voltage control sense input. V5 3 Analog input 5V over-voltage/under-voltage control sense input. V12 7 Analog input 12V over-voltage/under-voltage control sense input. OPP 4 Analog input Over-power sense input. This pin is connected to driver transformer or the output of current transformer. When not in use, this pin should be grounded. PSON 1 Logic input Remote On/Off logic input forʳCPU or controller. Turn on/off the PWM Output after the 7.5 msec / 26 msec delay. PSON = 0 means that the main SMPS is operational. PSON =1 means that the main SMPS is off and the latch is reset. NVP 6 Analog input The protection input for negative output, such as –12V and/or –5V. Trip voltage = 2.1V. UVAC 5 Analog input AC fail detection, detect main AC voltage under-voltage and/or failure. COMP 16 Analog output Error amplifier output and the input of the PWM comparator. IN 17 Analog input The negative input of error amplifier. The positive input of error amplifier is a 2.5V reference voltage. SS 18 Analog input The soft-start. It is settable through external capacitor. The current source output at this pin is 8uA and the voltage is clamped at 2.5V. OP1/OP2 9/8 Analog output The totem-pole output drivers of push-pull PWM. The output are enabled (low) only when the NAND gate inputs are high, the maximum duty cycle on an output (OP1 or OP2) is 46%. FB1 14 Analog output Output for first converter regulation loop. VREF1 13 Analog input Reference comparison input for first converter regulation loop. 2.5V. FB2 11 Analog output Output for second converter regulation loop. VREF2 12 Analog input Reference comparison input for second converter regulation loop. 2.5V. RI 19 Program. Analog input Connected to external resistor for the reference setting. RI = 75k ohms. GND 15 Supply Ground. ©System General Corp. Version 2.3(IRO33.0011.B0) -2- www.sg.com.tw June 19, 2003 Product Specification SG6105 Power Supply Supervisor + Regulator + PWM BLOCK DIAGRAM V33 V5 V12 UVAC RI PG GND VCC 2 3 7 5 19 10 15 20 DSD Vref 2uA UV Detector 0.7V + Delay 3sec UV Protector 3.2V FB1 13 VREF1 11 FB2 12 VREF2 Delay 300msec OV Protector 5V 14 _ COMP _ COMP + 64uA 2.1V NVP 6 2.4V OPP 4 _ COMP 2.5V D D _ COMP _ 8uA Q Q CK _ Q + CK Delay 7msec + Buffer Vcc Delay 7msec + Buffer 9 OP1 8 OP2 COMP R + _ 1.4V PSON 1 _ COMP + On/Off Delay 26msec 7.5msec ©System General Corp. Version 2.3(IRO33.0011.B0) O.S.C Error Amp Delay 15msec Vcc S Delay 2msec Q R 18 17 16 SS IN COMP -3- www.sg.com.tw June 19, 2003 Product Specification SG6105 Power Supply Supervisor + Regulator + PWM TIMING DIAGRAM VCC PSON 3.3V,5V,12V tPSON(ON) tUVP NVP SS(on/off) PG tNVP tPSON(OFF) tPSOFF tPG VCC PSON Voltage < VUVAC UVAC OPP tOPP SS(on/off) PG ©System General Corp. Version 2.3(IRO33.0011.B0) -4- www.sg.com.tw June 19, 2003 Product Specification SG6105 Power Supply Supervisor + Regulator + PWM ABSOLUTE MAXIMUM RATINGS Symbol Parameter Value Unit VCC DC Supply Voltage at Pin 20 16 V VFB Shunt Regulator Output at Fb1, Fb2 Pins 16 V IOUT Output Current at PG, Fb1, Fb2 Pins 30 mA PD,25к Power Dissipation (TA=25 1.5 W PD,90к Power Dissipation (TA=90 0.5 TSTG Storage Temperature Range -55 to +150 RθJA Thermal Resistance, Junction-To-Air 82.5 TJ,MAX Operating Junction Temperature 150 TA,MAX Operating Ambient Temperature -30 to +125 TL Lead Temperature (Soldering, 10sec) 260 ESD Capability, HBM model 3.0 к) к) W к к/W к к к kV Note: All voltage values, except differential voltage, are with respect to network ground terminal. RECOMMENDED OPERATING CONDITIONS Symbol Parameter Value Unit VCC DC Supply Voltage at Pin 20 4.5 to 5.5 V VFB Shunt Regulator Output at Fb1, Fb2 Pins 4 to 16 V TOPER Operating Ambient Temperature Range -25 to +85 к ELECTRICAL CHARACTERISTICS (VCC = 5V, TA = 25°°C) Symbol Parameter Test Condition Min. Typ. Max. Unit ICC Total Supply Current PG High - 5 10 mA VOVP1 Over-Voltage Protection 3.3V - 3.9 4.1 4.3 V VOVP2 Over-Voltage Protection 5V - 5.8 6.1 6.5 V VOVP3 Over-Voltage Protection 12V - 13.9 14.5 14.9 V VUVP1 Under-Voltage Protection 3.3V - 2.0 2.6 2.8 V VUVP2 Under-Voltage Protection 5V - 3.0 3.6 3.9 V VUVP3 Under-Voltage Protection 12V - 6.0 7.2 8.0 V VUVS1 Under-Voltage Sense 3.3V for PG Low - 2.5 2.8 3.0 V VUVS2 Under-Voltage Sense 5V for PG Low - 4.0 4.3 4.5 V VUVS3 Under-Voltage Sense 12V for PG Low - 9.4 10.1 10.4 V VOPPS* 1 Over-Power Protection. VUVAC = 1.5V 2.02 2.4 2.66 V VNVP Negative Voltage Protection: Voltage Level - 2.0 2.1 2.2 V INVP Negative Voltage Protection: Source Current RI = 75kΩ 57 64 72 uA tOVP Timing for Over-Voltage Protection RI = 75kΩ 0.37 0.7 1.35 ms tUVP Timing for Under-Voltage Protection RI = 75kΩ 0.8 2.4 3.75 ms tUVS Timing for Under-Voltage Sense for PG Low RI = 75kΩ 0.37 1.2 1.88 ms tOPP Timing for Over-Power-Protection RI = 75kΩ 3.3 7 11.3 ms tNVP Timing for Negative Voltage Protection RI = 75kΩ 3.3 7 10.2 ms Note *1: VOPPS = (2/3) x VOPP + (1/3) x VUVAC ; ©System General Corp. Version 2.3(IRO33.0011.B0) -5- www.sg.com.tw June 19, 2003 Product Specification SG6105 Power Supply Supervisor + Regulator + PWM Shunt Regulator (FB1, VREF1, FB2, VREF2) Symbol Parameter Test Condition VREF Reference Voltage IFB = 0.5mA, TA = 25 VDEV, I *2 Deviation of VREF Over Load Current IFB = 0.5mA to 10mA - VDEV, T * 2 Deviation of VREF Over Temperature TA = -25 - REGLI-FB*2 Line Regulation 4 < VFB < 16V - IOUT-FB*2 Output Sinking Current Capability VFB > 2V 10 к to 85к к Min. Typ. Max. Unit 2.475 2.5 2.525 V - 20 mV 10 30 mV 1 - mV/V - - mA Note *2: Not tested in production test. Power Good Section Symbol Parameter Test Condition Min. Typ. Max. Unit tPG Timing for PG Delay RI = 75kΩ 200 300 400 ms VUVAC UVAC Voltage Sense for PG - 0.65 0.7 0.75 V tR*2 PG Good Output Rising Time CL = 100pF - 1 - us tF*2 PG Good Falling Time CL = 100pF - 300 - ns VOL2 Power Good Output Saturation Level IPG = 5mA - - 0.5 V ION2 Power Good Leakage Current Collector VPG = 5V - - 1 uA Remote On/Off Symbol Parameter Test Condition Min. Typ. Max. Unit VPSON PSON Input Threshold Level - 1 1.4 2.0 V IPSON Remote Input Driving Current - - - 0.5 mA tPSON(ON) tPSON(OFF) Timing PSON to On/Off On Off (PS-off) RI = 75kΩ 17 5 26 7.5 45 28.8 ms tPSOFF Timing PG low to Power Off RI = 75kΩ 1.5 2 6.3 ms Error Amplifier Symbol Parameter Test Condition Min. Typ. Max. Unit V2.5 Reference Voltage - 2.45 2.5 2.55 V IIB*2 Input Bias Current - - - 0.1 uA AVOL * 2 Open-Loop Voltage Gain - 50 60 - dB BW * 2 Unity Gain Bandwidth - 0.3 1 - MHz PSRR * 2 Power Supply Rejection Ratio - 50 - - dB Oscillator Section Symbol Parameter Test Condition Min. Typ. Max. Unit FOSC PWM Frequency RI = 75kΩ 60 65 70 KHz Soft-Start Section Symbol Parameter Test Condition Min. Typ. Max. Unit ISS Charge Current RI = 75kΩ 6 8 9.3 uA ©System General Corp. Version 2.3(IRO33.0011.B0) -6- www.sg.com.tw June 19, 2003 Product Specification SG6105 Power Supply Supervisor + Regulator + PWM Comparator Section Symbol Parameter Test Condition Min. Typ. Max. Unit DC Duty Cycle - 85 - 93 % PWM Output Section (OP1, OP2) Symbol Parameter Test Condition Min. Typ. Max. Unit VOL Output Voltage Low Io = 5mA - - 0.5 V VOH Output Voltage High V12 = 12V 4 - - V RO Output Impedance of VOH - 1.5 - 3.3 kΩ ©System General Corp. Version 2.3(IRO33.0011.B0) -7- www.sg.com.tw June 19, 2003 Product Specification SG6105 Power Supply Supervisor + Regulator + PWM APPLICATION 1 -12V + MAIN Transformer 12V + 5V + 3.3V + UVAC V33 V5 3.3V V12 VCC 5Vsb VREF2 5Vsb 47~100ohm STBY Transformer PG FB2 PSON VREF1 + OP1 SG6105 FB1 Pok 1Kohm PSon NVP -12V RI -5V GND 5V Vdd IN 12V COMP OP2 SS OPP ©System General Corp. Version 2.3(IRO33.0011.B0) -8- www.sg.com.tw June 19, 2003 Product Specification SG6105 Power Supply Supervisor + Regulator + PWM APPLICATION 2 OPP R61 CN2 3 2 1 R62 1 C39 F2 C40 2 2 1 OP1 D26 R63 L11 2 R65 2 D29 2 1 R66 + 1 Q13 C44 2 2 R71 R69 C48 OP2 1 1 2 3 2 4 5 10 TR2 2 2 2 10 6 8 U5 1 9 D35 D34 T7 E16-D + BD1 2 1 6 D33 5 2 4 R70 3 T6 C47 Q14 2 2 1 3 C46 D32 4 4 1 HHV D31 3 1 T5 D30 R67 R68 3 1 + 3 1 2 U4 SG6848 NC FB GND SEN NC VDD Gate 4 L12 D28 C42 C78 3 Q12 D27 8 2 7 8 RI 6 2 5 1 1 2 1 R64 1 C45 + 2 1 2 3 1 C50 R75 D37 D38 R73 1 2 2 1 2 4 1 C49 R74 R77 R78 C52 1 C51 R79 C53 R80 R81 R82 1 1 R85 3 C56 3 Q15 1 L13 C57 2 2 VZ3 Q16 D39 2 2 2 VZ4 1 2 1 D40 1 2 1 HHV + R87 C58 7 D41 R88 5 C59 5VSB C69 14 9 8 13 12 11 UVAC 10 T8 C60 V5 5V 3 VCC V33 RI V5 SS D45 20 19 18 C61 C62 R91 -12V 7 GND V12 FB1 OP2 VREF1 OP1 VREF2 16 5V R94 12V C64 R95 15 R97 14 L14 FB1 R98 3 12V NVP COMP 8 13 VR3 2 VREF1 D43 R99 C65 C66 D44 2 OP2 1 1 6 UVAC 1 R96 5 2 UVAC C63 1 R92 R93 3 1 IN 2 OPP 17 3 1 4 OPP D42 D46 R90 2 PSON 2 2 3.3V -5V 1 1 U6 PSON R89 R103 1 R104 2 R86 R84 R83 + C55 VREF1 C54 + + + FB1 1 R76 Q17 Q18 2 VREF2 7 5 3 D48 SG6105 R101 R102 C68 2 2 Q19 C67 PG 1 FB2 L15 D47 2 8 6 4 10 1 2 11 2 12 9 FB2 3 1 PG 1 10 1 9 OP1 R100 3 C73 C72 2 + 1 C74 R113 VREF2 1 L20 R115 1 C71 L19 -12V + + + L16 1 Q20 2 C75 R110 R111 2 R112 V5 R107 2 C79 L17 2 1 L18 + FB2 + 1 C70 + 1 R109 U7 LM7905 GND 3.3V C77 + 3.3VSENCE 3 VO R106 5V VI + R116 R105 12V 2 2 C76 -5V ©System General Corp. Version 2.3(IRO33.0011.B0) -9- www.sg.com.tw June 19, 2003 Product Specification SG6105 Power Supply Supervisor + Regulator + PWM Protection against over-voltage, short-circuit and fault conditions is mandatory in PC power supplies. These protection circuits can be realized by using many discrete components and comparators, which occupy a lot of PCB space and also add to assembling costs. This single chip controller IC provides complete protection circuits, shunt regulators, and PWM control function and with less number of components. SG6105 is an ideal controller IC for PC switching mode power supplies. threshold level. PG pin goes high when the above condition is reached. A 2K pull up resistor may connect to 5V. The VCC can be supplied from the 5V-standby. When the VCC voltage is higher than 7V, besides the shunt regulator, the circuit of SG6105 will be shutdown and reset. No extra power supply is needed. Two internal high precision 431 shunt regulators are built-in. It provides stable reference voltages. Complete PWM control circuitry including the error amplifier for push-pull or half-bridge operation. The features and benefits of this device are listed below: Supervisory Circuit Operation Example of Using SG6105 for the ATX Power Supply Over-voltage and under-voltage protection for 3.3V, 5V and 12V without external divider Over-power protection. UV protection for –12V and/or –5V. Power-down warning for power good signal. Power good signal and power-fail lockup Remote on/off control. Delay time for PSON and PS-off signal. Two shunt regulator for 3.3V and 5V-Standby regulation. Complete pulse width modulation (PWM) control circuitry. On-chip oscillator. Programmable Soft-Start. Maximum 93% duty cycle Few external components More reliable system Little space on PCB Easy trouble-shooting and implementation FEATURE DESCRIPTIONS Over voltage protection can be implemented without any additional components. Over-voltage sense Levels or 3.3V, 5V, 12V are 4.1V, 6.1V, 14.5V respectively. Over current and/or short circuit protection can also be achieved by using over-power protection, in which OPP pin is connected to the current transformer (driver transformer). The power good signal is asserted to indicate the 3.3V, 5V and 12V is above the under voltage ©System General Corp. Version 2.3(IRO33.0011.B0) - 10 - The PC generates the remote ON/OFF logic (PSON), which is “Low” for power supply “On” and “High” to switch off the power supply. The remote ON/OFF is connected to PSON input. APPLICATION GUIDES Introduction The application guide shows the key-feature of SG6105 and illustrates how to use in an ATX switching mode power supply (SMPS). SG6105 is suitable for half-bridge, push-pull topology. It incorporates with a 4-channel supervisor, including 5V-standby. The PWM section of SG6105 comprises a built-in 65kHz oscillator and high immunity circuits, which protect the system from noise interference and provide more noise margins for improper PCB layout. SG6105 has OVP and UVP for 12V, 5V and 3.3V. Besides, the NVP is used for negative voltage protection, such as –12V and/or –5V. The UVAC (AC fails detection) is applied to detect AC line condition. Two built-in internal precision TL431 shunt regulators can be used for 3.3V or 5V auxiliary standby power. AC Fails Detection Through a resistor divider, UVAC is connected to the secondary power transformer for detecting the AC line condition. Once the voltage of UVAC is lower than 0.7V for a period of time, such as 200usec, the PG (power good) signal will be pulled low to indicate an AC line power-down condition. The voltage amplitude of the www.sg.com.tw June 19, 2003 Product Specification SG6105 Power Supply Supervisor + Regulator + PWM PWM switching signal in the secondary power transformer is proportional to the AC line voltage. Adjust the ratio of resistor divider to decide the threshold of power-down warning. A small capacitor is connected from UVAC to ground for filtering the switching noise. VS Vo Vin R1 + R2 C1 UVAC 0.7V Negative Voltage Protection The NVP provides an UVP (under voltage protection) for negative voltage outputs. An under-voltage represents the phenomenal of the overload condition in negative voltage output. For example, the –12V output may drop to –10V during the overload situation. A resistor determining the threshold of the protection is connected from pin NVP to the negative voltage output. Via this resistor, NVP outputs a 64uA constant current to the negative voltage output. When the NVP voltage is over 2.1V and the situation kept for longer than 7 msec, 6105 will lock the power outputs off. VNVP = 64 uA × (R1 + R2) – V-12V Over Power Protection (OPP) The OPP (over power protection) is used for detecting over power and/or short-circuit conditions. When OPPS voltage (p.4, Note-1) is higher than 2.1V and this situation existed for longer than 7 msec, 6105 will pull the PG low and lock off the power outputs. The power outputs will be locked off when VNVP ≥ 2.1V. 64uA R1 + OP1 R2 -12V 2.1V -5V Vdd R1 OP2 R2 OPP C1 ©System General Corp. Version 2.3(IRO33.0011.B0) R3 - 11 - www.sg.com.tw June 19, 2003 Product Specification SG6105 Power Supply Supervisor + Regulator + PWM MECHANICAL DIMENSIONS 20 PINS – DIP (D) Ӱ D 11 20 E1 eB E 10 1 A2 A L e b1 A1 b Dimension Symbol A A1 A2 b b1 D E E1 e L eB θ˚ Millimeter Min. Typ. Max. Inch Min. Typ. 5.334 0.381 3.175 24.892 6.223 2.921 8.509 0̓ ©System General Corp. Version 2.3(IRO33.0011.B0) 3.302 1.524 0.457 26.162 7.620 6.350 2.540 3.302 9.017 7̓ 3.429 0.015 0.125 26.924 0.980 6.477 0.245 3.810 9.525 15̓ 0.115 0.335 0̓ - 12 - Max. 0.210 0.130 0.060 0.018 1.030 0.300 0.250 0.100 0.130 0.355 7̓ 0.135 1.060 0.255 0.150 0.375 15̓ www.sg.com.tw June 19, 2003 Product Specification SG6105 Power Supply Supervisor + Regulator + PWM DISCLAIMERS LIFE SUPPORT System General’s products are not designed to be used as components in devices intended to support or sustain human life. Use of System General’s products in components intended for surgical implant into the body, or other applications in which failure of the System General’s products could create a situation where personal death or injury may occur, is not authorized without the express written approval of System General’s Chief Executive Officer. System General will not be held liable for any damages or claims resulting from the use of its products in medical applications. MILITARY System General's products are not designed for use in military applications. Use of System General’s products in military applications is not authorized without the express written approval of System General’s Chief Executive Officer. System General will not be held liable for any damages or claims resulting from the use of its products in military applications. RIGHT TO MAKE CHANGES System General reserves the right to change this document and/or this product without notice. Customers are advised to consult their System General sales representative before ordering. ©System General Corp. Version 2.3(IRO33.0011.B0) - 13 - www.sg.com.tw June 19, 2003